In the morning we will take National Route No.4 to the west of Phnom Penh to visit Chambok, a community-based ecotourism site, located at the border of Kirirom National Park in Kampong Speu Province. The site containes a beautiful 40-meter waterfall, which can be reached via a 3.8km nature trail. Also, the area serves as a model for best practices in community-based ecotourism in Cambodia. We will do mountain trekking to explore the fabulous forest landscape and high waterfall as well as a bat cave. On the path along the bamboo forest, we have the chance to watch the birds and if lucky to see other wildlife. In the rainy season, for those who like swimming, swimming is possible in the stream. Enjoy a picnic lunch. [Lunch]